StudySize 2.0

Easy to use
Calculations for most standard tests as well as for parameters in common statistical distributions
Comprises hypothesis testing, point estimation, and confidence interval
Any parameter can be calculated (not only sample size and power)
Simultaneous power comparisons in multiple windows
Includes equivalence- and non-inferiority testing for most tests
Monte Carlo simulation when large sample formulas are inappropriate
Group sequential interim analyses by Monte Carlo simulations for most tests and confidence intervals
Non-parametric tests (Wilcoxon-Mann-Whitney test, Wilcoxon signed-rank test, and Sign test)
Results presented as single values or in tables and graphs grouped by two other parameters